I went to a Dave Matthews Band concert the other evening - he's kicked off his summer tour and this is the first of three DMB concerts I'll be attending this summer. It's been an annual thing of mine since 1996, so while I'm not a crazy fan, I consider myself a true fan of the band. Now, I'm not old. At least, I don't think I am, I'm still (barely) in the early 20s and that's young enough to have a good time. But I was considerably irritated by certain people surrounding me at the conce...